Method for eliminating multipath interference in system symbol in underwater sound orthogonal frequency-division multiplexing system
An orthogonal frequency division and system symbol technology, which is applied in the field of intra-symbol multipath interference cancellation in underwater acoustic orthogonal frequency division multiplexing systems, can solve the problems of inaccurate channel estimation, and the influence of cyclic prefix multipath interference is not considered. Achieve good performance, eliminate the influence of multipath interference, and significantly improve performance
Active Publication Date: 2014-06-18
XIAMEN UNIV
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However, in the existing channel estimation, only the multipath interference effect of the symbol itself is considered, and the influence of the multipath interference caused by the cyclic prefix on the symbol itself is not considered, and the channel estimat
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[0041] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described below in combination with specific embodiments and with reference to the accompanying drawings.
[0042] The present invention considers a cyclic prefix-based Orthogonal Frequency Division Multiplexing (OFDM) communication system, the block diagram of which is as follows figure 1 As shown, at the sending end of the comb-pilot-based OFDM system, the total number of subcarriers in each OFDM symbol is N, and M pilot symbols are inserted, and these M pilot symbols occupy the corresponding M subchannels , where L=N / M, that is to say every L-1 data sub-channel inserts a pilot symbol, X p (m) is the value of the inserted mth pilot symbol, X D(m) is the inserted useful data symbol, and X(k) is the data in the OFDM symbol. The original bit information sent is evenly inserted into the pilot after QPSK modulation, and the frequency dom...
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The invention provides a method for eliminating multipath interference in a system symbol in an underwater sound orthogonal frequency-division multiplexing system, and relates to underwater sound wireless communication. The method includes the step of underwater sound orthogonal frequency-division multiplexing communication system transmitting end signal processing and the step of underwater sound orthogonal frequency-division multiplexing communication system receiving end signal processing. The transmitting end signal processing is achieved through the steps of conducting quadrature phase shift keying symbol mapping and serial-parallel conversion on sent bit information, inserting comb-type pilot frequencies in a parallel signal, conducting OFDM on signals inserted into the pilot frequencies, adding cyclic prefixes, conducting digital to analog conversion on the signals, and conducting up-conversion sending, wherein the number of the pilot frequencies is smaller than the total number of subcarriers. The receiving end signal processing is achieved through the steps of conducting down-conversion and analog to digital conversion on the received signals, conducting serial-parallel conversion and OFDM on the signals, conducting channel estimation based on compressed sensing, conducting multi-path interference elimination on an estimated data set (ap, taup), and judging and outputting the signals where interference elimination is conducted through decoding, wherein ap is the amplitude value of each path, and taup is the time delay of each path.
Description
technical field [0001] The invention relates to underwater acoustic wireless communication, in particular to a method for eliminating multipath interference within a symbol of an underwater acoustic orthogonal frequency division multiplexing system based on compressed sensing theory. Background technique [0002] Underwater sound is an underwater wireless long-distance communication transmission means. Multi-carrier communication is an effective means to realize high-speed underwater acoustic communication. The most important obstacle in high-speed underwater acoustic communication is mutual symbol interference caused by random multipath interference. Orthogonal frequency division multiplexing is a special multi-carrier modulation method. Its main advantages are strong anti-multipath interference ability, high transmission rate, and full utilization of the frequency band width. This technology has been successfully applied in many fields, such as asymmetric digital subscrib...
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Inventor 孙海信蒯小燕齐洁
Owner XIAMEN UNIV
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